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Why copper matte is put in silica lined ...

Why copper matte is put in silica lined converter?

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Copper matte mainly contains `Cu_(2)S` and FeS. For removing the gangue, FeS, silica present in the lining of the Bessemer converter acts as a flux and forms slag on reaction with FeO.
`underset("(Gangue)")(2FeS) + 3O_(2) to 2FeO +2SO_(2)`
`underset("(Gangue)")(FeO) + underset("(Flux)")(SiO_(2)) to underset("(Slag)")(FeSiO_(3))`
Therefore, whole of the iron present in matte, is removed as slag.
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